Built 2007 Mazdaspeed 3

So I had my 07 Mazdaspeed 3 engine built with forged pistons, new block, new clutch, turbo, and more, about a year ago. The car has been a massive headache and uses/leaks an insane amount of oils. It’s sitting and rarely driven, car does run well and pulls hard. I plan on selling it once it’s paid off in a month or two. It has 103000 miles. I plan to disclose all the known issues to potential buyers.

Im looking for advice regarding how to sell the car and asking price. I was going to start pricing at $3500, but these cars seem to be very cheap. Any advice appreciated. I may try trading it in and just asking fair KBB trade in, which is about $2700.